Grinder



Nov. 3,1925. n 1,560,507 A. F. FRQUSSARD GRINDER Filed4 Nov. 5, 1923 2Sheets-Sheet l Patented Nov. 3, 1925.. Y

UNirEDTArEs PATENT n ALBERT F. FBOUSSARD,

. yGiannina.

0F ST. LOUIS, MISSOURI.

To `all 'whom it may concern:

Be it known that I, ALBERT a citizen of the United States, 4residing atthe city of St. Louis, in the Stateof Missouri, have invented certainnewand useful Improvements in Grinders, of which theI following is aspecification.

This, invention relates to grinders for polishing the internal,ycylindrical surfaces of internal lcombustion-engines vand ,the like, andpertains more particularly to improvements in that type oy grinder whichforms the subject-matter of my prior application for patent, SeriallNumber 627,267, filed March 24, 1923.

One of the objects of the present invention v is to provide improvementsin the Grinder head, which will simplify its manuacture and materiallylowerthe costs of its production.

Another object `is to provide a novelmeans for extendin the abrasiveblocks diametrically, thereby adapting a single sizefgrinder tocylinders of widely varying diameters, and, also, enabling the use ofthe abrasive blocks after they have become worn to such a degree thatordinarily they would have been discarded. 4

A further object is to provide a -novel means for coupling an extensionlor lengthening rod to the grinder-head shaft 0r spindle. f

Other objects and advantages will appea as the description proceeds. g A

In the -accompanying drawings forming part of this specification, inwhich like numbers of reference denote like parts wherever they occur,

Figurel 1s a transverse section taken `on the line 1-1 of Figure 2; V

' Figure 2 is an elevation of the complete grinder and extension rod;

Figure 3 is a' transverse section taken on the line 3--3 of Figure 2;

Figure 4 Jis a transverse section taken on the line 4-4vof Figure 2;Figure 5 is a transverse section taken on the line 55 of Figure 2;Figure 6 is a longitudinal central section; taken perpendi'cularly toFigure 2;

. Figure is a transverse section taken'on' I the line 7-7 of Figure 6;

Figures 8 and. 9 are fragmentary' y:front land side elevations,respectively, showing an extension applied to an abrasive block; and

F. FnoUssARn,

ingl an opening 29, for the passage Figure l() is a transverse sectiontaken on the line 10.-10 of Figure v8. f

A vertical spindle lconsists of an upper portion 2 of hexagonalcross-sectioman intermediate cylindrical portion 3, a portion 4 ofsquare cross-section nnear its lower extremity, a cylindrical portion 5between portions 2 andI 3, and 'cylindrical portions 6 immediatelyadjoining the square portion 4 at each of its ends. Rectangular retainerG5 7 for abrasive block 8 are formed, each of a single piece of sheetmetal, bent to a channel shape, havingtwoiparallel side walls 9,

connected by a perpendicular inner' wall 10, and having an open outerside 11, restricted `by inwardly extending ianges 12, projectingperpendicularly from the side walls 9.,` The retainers 7 have v45degrees bevels 13 on their inner edges, and are secured to the squareportion 4 of the spindle 1 by screws 'i 14, litting'tapped holes 15 inthe-portion 4, the beveled edges 13 of the several retainers 7 being incontact with one another, whereby tliey mutuallyretain-one anotheragainst angular movement about the screws 14. The cylindrical portionsl6 are of Asmaller diameter than the square portion 4 and haverexternalthreads 16 for the reception ofnuts 17. cylindrical shell 18,having a bottom wall 19, containing a concentric c lin- ,S5 dricalaperture 20, for the reception o the Aupperofy the cylindrical portions6, isi

clamped between upper nut 17 and shoul.- A der 21, Jforming the\upperterminus of portion .4. The` lower face of wall 19 is pro- 90 .'yidedwith projections 22 and depressions 23. The projections 22 lit closelybetween the retainers 7 whose ends are held'within the depressions 23. Aplate 24, containing a concentric cylindrical aperture 25, for thereception of the lower ofthe cylindrical portions 6,xis clamped betweenlower nuts 17 and shoulder 26, forming the lower terminus. of por-tion'4. The upper face of Lplate24, also, has projections 22 and de- 100.pressions 23, which function similarlyv to those on shell 18 t engagethe )lower end of the retainers 7. Shell 1 8 and plate 24 close the openendsof the retainers 7, and

, prevent longitudinal movement of the blocks L8. Shell 18l is adaptedto contain kerosene` or other lubricant, whichl is e'xuded through ports27 by Icentrifugal force when the gninderis in rapid rotation. A cap 28,havof the no movement imparted to said blocks by compression springs 34,interposed between each pair of diametrically opposed blocks Sand heldin passages 35 in the spindle 1 and corresponding-passages 36 in theinner walls l0 of the retainers 7. The blocks 8 are pro# l tected fromthe cutting action of the springs 34 by shields '37 interposed betweensaid spring 34 and blocks 8. -The shields 37 are preferably formed ofsheet metal and have perpendicular projections or tits 38. The blocks 8can be withdrawn from the retainers 7 at the lower end after plate 24has been removed, but the shields 37 are retained in the retainers 7 bythe engagement of the tits 38 with the springs 34. The blocks haverounded grinding surfaces 39, which conform Lto the internal surfaces ofthe cylin-4 ders to be ground.

To 'enable the grinder to accommodate a wider range of cylinderdiameters, extensions 40 for the blocks 8 are provided, as

shown in Figures 8, 9, and 10. These eX- tensions are preferably formedof sheet metal and consist substantially .of two side 'walls 41connected 4*by an inner, wall 4 2.

The side walls 41 are bent outwardly at their inner ends Hto formflanges 43, which contact with the flanges 12 of the retainers 7, 40

and'theeby limit the outward movement of said extensionsl by the actionof the compression springs 34. The 'free ends of the walls 41 are bentto form channels 44, adapted to receive they anges 33 of the blocks 8,and prevent transverse movement of the blocks 8 with respect to theextensions 40. The .extensions 40 are of the same length as the blocks8, except at the channels 44, which project beyond the lends' of theextensions 40 to receive the-,cross-member 45 and tube 46. Cross-member45 has shoulders'47 formed by reducing the ends' 48, which extendthrough holes 49 in the channels 44, and are peened over against theoutside of the channels 44, rivet fashion, clamping the channels 44against the; shoulders .47. A screw 50 passesthroughl holes 51 in theother ends of the channels 44 and through spacing tube 46, and is pro"-vided with a nut 52, which is screwed against f the outside of one ofthe channels 44, and thereby clamps the said channel against the end ofthe tube 46, and the other channel.. between the head 53 of the screw 50and` 1 the other end of the tube 46. Both crossmember 45 and screw 50strengthen and stiffen the extension 4Q, and, also, serve as stops toprevent longitudinal movement of blocks 8 in extensions 40, cross-member45 forming a permanent connection and screw 5() a removable connectionto permit removal of block 8 ,for replacement`V or other reasons.Extensions 40, also, prolong the useful life of the abrasive blocks 8,by enabling them to be extended after they have become worn to such anextent that ordinarily they would have to be discarded.

The cylindrical portion 5 of spindle 1 is of smaller' diameter than theportion 3,/ forming a shoulder 54. A pin 55 passes transversely throughpart 5, and is secured therein by a tight it, its ends projectingtherefrom at dia-metrically opposite points. In grinding the cylindersof certain types of engines, it occurs that the spindle 1 is ofinsufficient length to enable the grinder head to reach the bottom ofthe cylinder, and an extension or lengthening rod 56 must be employed,as shown in Figures 2, 6, and 7, thev socket of the motor shaft beingconnected to the hexagonal shaped end 57 of the rod 56, instead ofdirecting to the hexagonal portion 2 of the spindle 1, asis usual, whenthe extension 56 is not used. The cylindrical portion 5 8 of rod 56 hasa concentric cylindrical recess 59 at its lower end, forming a tubularportion 60 to receive p'ortions 2 and 5 of the spindle 1. lend ofAtubular portion 60'is split at diametrically opposite points bylongitudinallyextending slots 61, having their upper ends The lowercommunicating with slots 62, which extend from vslots 61 in acounter-clockwise direction and at a slight incline "from thehorizontal, looking from the top of the rod 56. In connecting rod 56 tospindle .1, portion 60 is brought directly overu spindle 1 and pusheddown, so lthat the projecting ends of pin 55'pass into the slots 61,until the pin 55 abuts against the top edges of the slots 62, afterwhich lrod 56 is rotated in a' clockwise direction, causing the tonguesG3 to become wedged between shoulder 54 and' the projecting ends of thepin 55, whereupon rod 56 and spindle 1 rotate as one unit in a clockwisedirection, but become disengaged upon reversing the direction .ofrotation.

V/The depth of travel of the rinder in the cylinder is limited by a saety stopping plate 64, adapted to engage the end of the cylinder andthereby prevent damage to the honer by running the same below the bottomof ^the cylinder. Plate/64 can be set on shank 11 togaccornmodateA'different lengths of lcylinders byl a headlessy set screw 65.

Having' thus described this invention, I

hereby reservefthe benefit of all changes in form, arrangement, order,or use of parts, as it is'evident that many minor changes may be madetherein without departing ran ' the said sides, and side platesextending perpendicularly from the said base plate and connectedthereby, there being beveled outer faces at the base of said sideplates, the said retainers being arranged contiguously to one anotherwith the said beveled faces forming their common meeting faces. 2. In agrinder, thel combination of a spindle having a squared portion providedWith crossed pairs of transverse passages, a retainer removably securedtoeach face of thesquared portion of the spindle and having passagesVregistering with one `pair of .the transverse passages in the spindle,an

abrasive block longitudinally removably positioned- Within eachretainer, axially adjustably means' carried by the spindle for holdingsaid blocks against removal, means in said pairs of registering passagesfor forcingl said blocks radially outwardly, and means carried by saidretainers and blocks for restricting the radial movement of the latter.

3. In a grinder, the' combination of arotating head having a pluralityof plane sidesy in its periphery, a plurality of retainers secured tothe said sides, the said retainers each consisting of a base plate onthe said sides, and side plates extending perpendicularly from the saidbase plate and connected thereby, there being beveled oute'r faces atthe base of said side plates, the said retainers being arrangedcontiguously to one another with the said beveled faces forming theircommon meeting faces, and abrasive blocks removably carried by saidretainers.

4. In a grinder, the combination of a ro-v tating head provided With aplurality of plane sides in its periphery, a plurality of retainerssecured to the said sides, the said retainers each consisting of a baseplate on the said sides, and side plates extending perpendicularly fromthe said base plate and connected thereby, there being beveled outerfaces at the `base of said side plates, the

said retainers being arranged contiguously to one another with the saidbeveled faces forming their common meeting faces, abrasive blockscarried by the said retainers, means for forcing said abrasive `blocksradially outwardly of the rotating head, and means for preventing theblocks from accidentally being disconnected from the retainers.v

In testimony whereof I hereunto affix my signature.

ALBERT F. FROUSSARD.

